A third stated: "Some animals like horses are able to carry people but this poor tortoise is not ... Tortoises are not accustomed to carry people."

Bilzerian, a 36-year-old professional poker player and trust fund beneficiary from Florida, feeds his followers with a regular stream of photos of his high-flying playboy lifestyle.

He posted several photos of his time on Necker Island, including one where he says: "Shoutout to @richardbranson for being rich enough to buy a private island and make it an endangered animal sanctuary."

The 72-acre island, bought by Sir Richard in the 1970s, is said to be home to more than 140 species of animal.